Accès ouvert déclaré
2008
article
Multi-Lepton Production at High Transverse Momenta in ep Collisions at HERA
H1 Collaboration, F. D. Aaron, A. Baghdasaryan, V. Jemanov, L. Jönsson, D. P. Johnson, A. W. Jung, H. Jung, M. Kapichine, J. Katzy, I. R. Kenyon, C. Kiesling, M. Klein, P. Baranov, C. Kleinwort, T. Klimkovich, T. Kluge, A. Knutsson, R. Kogler, V. Korbel, P. Kostka, Michael Krämer, K. Krastev, J. Kretzschmar, E. Barrelet, A. Kropivnitskaya, K. Krüger, K. Kutak, M. P. J. Landon, W. Lange, G. Lastovicka-Medin, P. Laycock, A. Lebedev, G. Leibenguth, V. Lendermann, W. Bartel, S. Levonian, G. Li, K. Lipka, A. Liptaj, B. List, J. List, N. Loktionova, R. Lopez-Fernandez, V. Lubimov, A. -i. Lucaci-timoce, M. Beckingham, L. Lytkin, A. Makankine, E. Malinovski, P. Marage, Ll. Marti, H.-U. Martyn, S. J. Maxfield, A. Mehta, K. Meier, A. B. Meyer, K. Begzsuren, H. Meyer, J. Meyer, V. Michels, S. Mikocki, I. Milcewicz-Mika, F. Moreau, A. Morozov, J. V. Morris, M. U. Mozer, O. Behnke, M. Mudrinic, K. Mueller, P. Murin, K. Nankov, B. Naroska, Th. Naumann, P. R. Newman, C. Niebuhr, A. Nikiforov, G. Nowak, A. Belousov, K. Nowak, M. Nozicka, B. Olivier, J. E. Olsson, S. Osman, D. Ozerov, V. Palichik, I. Panagoulias, M. Pandurovic, T. Papadopoulou, N. Berger, C. Pascaud, G. D. Patel, O. Pejchal, H. Peng, E. Perez, A. Petrukhin, I. Picuric, S. Piec, D. Pitzl, R. Placakyte, J. C. Bizot, R. Polifka, B. Povh, T. Preda, V. Radescu, A. J. Rahmat, N. Raicevic, A. Raspiareza, T. Ravdandorj, P. Reimer, E. Rizvi, C. Alexa, M. -o. Boenig, P. Robmann, B. Roland, R. Roosen, A. Rostovtsev, M. Rotaru, J. E. Ruiz Tabasco, Z. Rurikova, S. Rusakov, D. Salek, F. Salvaire, V. Boudry, D. P. C. Sankey, M. Sauter, E. Sauvan, S. Schmidt, S. Schmitt, C. Schmitz, L. Schoeffel, A. Schöning, H.-C. Schultz-Coulon, F. Sefkow, I. Bozovic-Jelisavcic, R. N. Shaw-West, I. Sheviakov, L. N. Shtarkov, S. Shushkevich, T. Sloan, I. Smiljanic, P. Smirnov, Y. Soloviev, P. Sopicki, D. South, J. Bracinik, V. Spaskov, A. Specka, Z. Staykova, M. Steder, B. Stella, U. Straumann, D. Sunar, T. Sykora, V. Tchoulakov, G. Thompson, G. Brandt, P. D. Thompson, T. Toll, F. Tomasz, T.H. Tran, D. Traynor, T. N. Trinh, P. Truöl, I. Tsakov, B. Tseepeldorj, I. Tsurin, M. Brinkmann, J. Turnau, E. Tzamariudaki, K. Urban, A. Valkarova, C. Vallée, P. Van Mechelen, A. Vargas Trevino, Y. Vazdik, S. Vinokurova, V. Volchinski, V. Brisson, D. Wegener, M. Wessels, Ch. Wissing, E. Wünsch, V. Yeganov, J. Zacek, J. Zalesak, Z. Zhang, A. Zhelezov, A. Zhokin, D. Bruncko, Y. C. Zhu, T. Zimmermann, H. Zohrabyan, F. Zomer, A. Bunyatyan, G. Buschhorn, V. Andreev, L. Bystritskaya, A. J. Campbell, Karla Beatriz Cantun Avila, F. Cassol-Brunner, K. Cerny, V. Cerny, V. Chekelian, A. Cholewa, J. G. Contreras, J. A. Coughlan, B. Antunovic, G. Cozzika, J. Cvach, J. B. Dainton, K. Daum, M. Deak, Y. de Boer, B. Delcourt, M. Del Degan, J. Delvax, A. De Roeck, S. Aplin, E. A. De Wolf, C. Diaconu, V. Dodonov, A. Dossanov, A. Dubak, G. Eckerlin, V. Efremenko, S. Egli, A. Eliseev, E. Elsen, A. Asmone, S. Essenov, A. Falkiewicz, P.J.W. Faulkner, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, M. Fleischer, A. Fomenko, A. Astvatsatourov, E. Gabathuler, J. Gayler, S. Ghazaryan, A. Glazov, I. Glushkov, L. Goerlich, M. Goettlich, N. Gogitidze, M. Gouzevitch, C. Grab, A.Bacchetta, T. Greenshaw, B.R. Grell, G. Grindhammer, S. Habib, D. Haidt, M. Hansson, C. Helebrant, R. C. W. Henderson, E. Hennekemper, H. Henschel, S. Backović, G. Herrera, M. Hildebrandt, K. H. Hiller, D. Hoffmann, R. Horisberger, A. Hovhannisyan, T. Hreus, M. Jacquet, M.E. Janssen, X. Janssen
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Le résumé fourni par la source
Abstract Processes leading to a final state with at least two high transverse momentum leptons(electrons or muons) are studied using the full e+-p data sample collected by the H1 exper-iment at HERA. The data correspond to an integrated luminosity of 463 pb-1. Di-leptonand tri-lepton event classes are investigated. Cross sections of the production of e+e- and u+u- pairs are derived in a restricted phase space dominated by photon-photon collisions.In general, good agreement is found with Standard Model predictions. Events are observed with a total scalar sum of lepton transverse momenta above 100 GeV where the Stan-dard Model expectation is low. In this region, combining di-lepton and tri-lepton classes, five events are observed in e+p collisions, compared to a Standard Model expectation of 0.96 +- 0.12, while no such event is observed in e-p data for 0.64 +- 0.09 expected. Dedicated to the memory of our dear friend and colleague, Beate Naroska.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
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Les sujets associés
Particle physics theoretical and experimental studiesComputational Physics and Python ApplicationsHigh-Energy Particle Collisions Research